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Applying the methods of stable isotopes and hydrochemistry to study the leakage from dyke is an effective way. But men only qualitatively analyzed and judged the problem. The authors attempted to perform the analysis of fuzzy clustering by applying the method of fuzzy clustering that stable isotopes and hydrochemistry values of 22 water samples were taken as index characteristic values and endued different weightings, combining some dyke. The clustering result showed that there was strong correlation in the data of stable isotopes, Cl- and TDS among the water samples of T12 borehole, gushing water 5 m north of T9 borehole, river water and the effluent of drainage ditch north of T9 borehole. It is a proof to judge the leakage path that the water samples may has the same replenishment source.